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                        <h1>MyBatis核心配置文件详解</h1>
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                <h3 id="mybatis的核心配置文件">MyBatis的核心配置文件</h3>
<p>核心配置文件主要用于配置连接数据库的环境以及MyBatis的全局配置信息。习惯上命名为mybatis-config.xml。核心配置文件存放的位置是src/main/resources目录下</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">核心配置文件中的标签必须按照固定的顺序:</span><br><span class="line">properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,objectWrapperFactory?,reflectorF actory?,plugins?,environments?,databaseIdProvider?,mappers?</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br></pre></td><td class="code"><pre><span class="line">&lt;?xml version&#x3D;&quot;1.0&quot; encoding&#x3D;&quot;UTF-8&quot; ?&gt;</span><br><span class="line">&lt;!DOCTYPE configuration</span><br><span class="line">        PUBLIC &quot;-&#x2F;&#x2F;MyBatis.org&#x2F;&#x2F;DTD Config 3.0&#x2F;&#x2F;EN&quot;</span><br><span class="line">        &quot;http:&#x2F;&#x2F;MyBatis.org&#x2F;dtd&#x2F;MyBatis-3-config.dtd&quot;&gt;</span><br><span class="line">&lt;configuration&gt;</span><br><span class="line">    &lt;!--引入properties文件，此时就可以$&#123;属性名&#125;的方式访问属性值--&gt;</span><br><span class="line">    &lt;properties resource&#x3D;&quot;jdbc.properties&quot;&gt;&lt;&#x2F;properties&gt;</span><br><span class="line">    &lt;settings&gt;</span><br><span class="line">        &lt;!--将表中字段的下划线自动转换为驼峰--&gt;</span><br><span class="line">        &lt;setting name&#x3D;&quot;mapUnderscoreToCamelCase&quot; value&#x3D;&quot;true&quot;&#x2F;&gt;</span><br><span class="line">        &lt;!--开启延迟加载--&gt;</span><br><span class="line">        &lt;setting name&#x3D;&quot;lazyLoadingEnabled&quot; value&#x3D;&quot;true&quot;&#x2F;&gt;</span><br><span class="line">    &lt;&#x2F;settings&gt;</span><br><span class="line">    &lt;typeAliases&gt;</span><br><span class="line">        &lt;!--</span><br><span class="line">        typeAlias:设置某个具体的类型的别名</span><br><span class="line">            属性:</span><br><span class="line">                type:需要设置别名的类型的全类名 alias:设置此类型的别名，若不设置此属性，该类型拥有默认的别名，即类名且不区分大小</span><br><span class="line">                若设置此属性，此时该类型的别名只能使用alias所设置的值 --&gt;</span><br><span class="line">                &lt;!--&lt;typeAlias type&#x3D;&quot;com.mybatis.bean.User&quot;&gt;&lt;&#x2F;typeAlias&gt;--&gt;</span><br><span class="line">                &lt;!--&lt;typeAlias type&#x3D;&quot;com.mybatis.bean.User&quot; alias&#x3D;&quot;abc&quot;&gt;</span><br><span class="line">        &lt;&#x2F;typeAlias&gt;--&gt;</span><br><span class="line">        &lt;!--以包为单位，设置改包下所有的类型都拥有默认的别名，即类名且不区分大小写--&gt;</span><br><span class="line">        &lt;package name&#x3D;&quot;com.mybatis.bean&quot;&#x2F;&gt;</span><br><span class="line">    &lt;&#x2F;typeAliases&gt;</span><br><span class="line">    &lt;!-- environments:设置多个连接数据库的环境 属性:</span><br><span class="line">    default:设置默认使用的环境的id</span><br><span class="line">    --&gt;</span><br><span class="line">    &lt;environments default&#x3D;&quot;mysql_test&quot;&gt;</span><br><span class="line">        &lt;!--</span><br><span class="line">        environment:设置具体的连接数据库的环境信息</span><br><span class="line">        属性: id:设置环境的唯一标识，可通过environments标签中的default设置某一个环境的id，</span><br><span class="line">        表示默认使用的环境</span><br><span class="line">        --&gt;</span><br><span class="line">        &lt;environment id&#x3D;&quot;mysql_test&quot;&gt;</span><br><span class="line">            &lt;!--</span><br><span class="line">            transactionManager:设置事务管理方式</span><br><span class="line">            属性:</span><br><span class="line">            type:设置事务管理方式，type&#x3D;&quot;JDBC|MANAGED&quot; </span><br><span class="line">                type&#x3D;&quot;JDBC&quot;:设置当前环境的事务管理都必须手动处理 </span><br><span class="line">                type&#x3D;&quot;MANAGED&quot;:设置事务被管理，例如spring中的AOP</span><br><span class="line">            --&gt;</span><br><span class="line">            &lt;transactionManager type&#x3D;&quot;JDBC&quot;&#x2F;&gt;</span><br><span class="line">            &lt;!--</span><br><span class="line">            dataSource:设置数据源</span><br><span class="line">            属性:</span><br><span class="line">            type:设置数据源的类型，type&#x3D;&quot;POOLED|UNPOOLED|JNDI&quot;</span><br><span class="line">                type&#x3D;&quot;POOLED&quot;:使用数据库连接池，即会将创建的连接进行缓存，下次使用可以从缓存中直接获取，不需要重新创建</span><br><span class="line">                type&#x3D;&quot;UNPOOLED&quot;:不使用数据库连接池，即每次使用连接都需要重新创建</span><br><span class="line">                type&#x3D;&quot;JNDI&quot;:调用上下文中的数据源 --&gt;</span><br><span class="line">            &lt;dataSource type&#x3D;&quot;POOLED&quot;&gt;</span><br><span class="line">                &lt;!--设置驱动类的全类名--&gt;</span><br><span class="line">                &lt;property name&#x3D;&quot;driver&quot; value&#x3D;&quot;$&#123;jdbc.driver&#125;&quot;&#x2F;&gt; &lt;!--设置连接数据库的连接地址--&gt;</span><br><span class="line">                &lt;property name&#x3D;&quot;url&quot; value&#x3D;&quot;$&#123;jdbc.url&#125;&quot;&#x2F;&gt; &lt;!--设置连接数据库的用户名--&gt;</span><br><span class="line">                &lt;property name&#x3D;&quot;username&quot; value&#x3D;&quot;$&#123;jdbc.username&#125;&quot;&#x2F;&gt; &lt;!--设置连接数据库的密码--&gt;</span><br><span class="line">                &lt;property name&#x3D;&quot;password&quot; value&#x3D;&quot;$&#123;jdbc.password&#125;&quot;&#x2F;&gt;</span><br><span class="line">            &lt;&#x2F;dataSource&gt;</span><br><span class="line">        &lt;&#x2F;environment&gt;</span><br><span class="line">    &lt;&#x2F;environments&gt;</span><br><span class="line">    &lt;!--引入映射文件--&gt; &lt;mappers&gt;</span><br><span class="line">    &lt;mapper resource&#x3D;&quot;UserMapper.xml&quot;&#x2F;&gt;</span><br><span class="line">        &lt;!--</span><br><span class="line">        以包为单位，将包下所有的映射文件引入核心配置文件</span><br><span class="line">        注意:此方式必须保证mapper接口和mapper映射文件必须在相同的包下 --&gt;</span><br><span class="line">        &lt;package name&#x3D;&quot;com.mybatis.mapper&quot;&#x2F;&gt;</span><br><span class="line">    &lt;&#x2F;mappers&gt;</span><br><span class="line">&lt;&#x2F;configuration&gt;</span><br></pre></td></tr></table></figure>
<h3 id="创建mapper接口">创建mapper接口</h3>
<p>MyBatis中的mapper接口相当于以前的dao。但是区别在于，mapper仅仅是接口，我们不需要</p>
<p>提供实现类。</p>
<h3 id="创建mybatis的映射文件">创建MyBatis的映射文件</h3>
<p>相关概念:ORM(Object Relationship Mapping)对象关系映射。</p>
<p>对象:Java的实体类对象</p>
<p>关系:关系型数据库</p>
<p>映射:二者之间的对应关系</p>
<p>1、映射文件的命名规则:</p>
<p>表所对应的实体类的类名+Mapper.xml 。</p>
<p>例如:表t_user，映射的实体类为User，所对应的映射文件为UserMapper.xml 。</p>
<p>因此一个映射文件对应一个实体类，对应一张表的操作。</p>
<p>MyBatis映射文件用于编写SQL，访问以及操作表中的数据。</p>
<p>MyBatis映射文件存放的位置是src/main/resources/mappers目录下。</p>
<p>2、MyBatis中可以面向接口操作数据，要保证两个一致:</p>
<p>mapper接口的全类名和映射文件的命名空间(namespace)保持一致 。</p>
<p>mapper接口中方法的方法名和映射文件中编写SQL的标签的id属性保持一致。</p>

                

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          <ol class="toc-nav"><li class="toc-nav-item toc-nav-level-3"><a class="toc-nav-link" href="#mybatis的核心配置文件"><span class="toc-nav-number">1.</span> <span class="toc-nav-text">MyBatis的核心配置文件</span></a></li><li class="toc-nav-item toc-nav-level-3"><a class="toc-nav-link" href="#创建mapper接口"><span class="toc-nav-number">2.</span> <span class="toc-nav-text">创建mapper接口</span></a></li><li class="toc-nav-item toc-nav-level-3"><a class="toc-nav-link" href="#创建mybatis的映射文件"><span class="toc-nav-number">3.</span> <span class="toc-nav-text">创建MyBatis的映射文件</span></a></li></ol>
        
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